CR123 vs CR123a: Which Battery is the Best for Your Device?
In actual fact, in the case of these batteries, there is no difference. If you search for 123 lithium batteries, you will often find a selection of CR123s or DL 123As. For this particular sized battery, the ''a'' makes no difference. For this reason, each of the batteries, and more specifically the CR123 and the CR123a are 100% interchangeable.
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